MCQ
+ $NH_3$ $\xrightarrow{\Delta }$ $A$, $'A'$ is


- A

- B

- ✓

- D








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$4C{a_5}{(P{O_4})_3}F + 18Si{O_2} + 30C \to 3{P_4} + 2Ca{F_2} + 18CaSi{O_3} + 30CO$

The number of compounds/species which obey Huckel's rule is $..........$